TITLE

An allometric smoothing function to describe the relation between otolith and somatic growth over the lifespan of walleye pollock (Theragra chalcogramma)

AUTHOR(S)
Katakura, Seiji; Ikeda, Hisatoshi; Nishimura, Akira; Nishiyama, Tsuneo; Sakurai, Yasunori
PUB. DATE
October 2007
SOURCE
Fishery Bulletin;Oct2007, Vol. 105 Issue 4, p447
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We propose a new equation to describe the relation between otolith length (OL) and somatic length (fork length [FL]) of fish for the entire lifespan of the fish. The equation was developed by applying a mathematical smoothing method based on an allometric equation with a constant term for walleye pollock (Theragra chalcogramma) --a species that shows an extended longevity (>20 years). The most appropriate equation for defining the relation between OL and FL was a four-phase allometric smoothing function with three inf lection points. The inflection points correspond to the timing of settlement of walleye pollock, changes in sexual maturity, and direction of otolith growth. Allometric smoothing functions describing the relation between short otolith radius and FL, long otolith radius and FL, and FL and body weight were also developed. The proposed allometric smoothing functions cover the entire lifespan of walleye pollock. We term these equations "allometric smoothing functions for otolith and somatic growth over the lifespan of walleye pollock."
ACCESSION #
28656404

 

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